Wavelength reservation protocols can be employed to dynamically set up and tear down lightpaths in WDM networks. The performance of these protocols in single-fiber WDM networks has been extensively studied. In this paper, the signaling protocols are extended for multi-fiber networks and novel wavelength selection policies are proposed. We compare the performance of different protocols in both single-fiber and multi-fiber WDM networks. The simulation results show our novel wavelength selection policies excel the other schemes. Related discussions on these results are included.
We introduce a general model for the calculation of the optical signal-to-noise ratio (SNR) of the optical cross-connection (OXC) in optical networks in this paper. The impact of two power equalization schemes on the optical SNR is presented. We also point out the EDFA design principle for optimizing noise character of OXC chains.
In this paper, routing and wavelength assignment (RWA) algorithms whose optimum object is the minimum number of wavelength required (MNWR) in WDM All Optical Network were studied. Since the number of wavelength required (NWR) obtained by the existing two RWA algorithms is associated with the numbering order of the nodes in the network, a statistical method was proposed to modify the RWA algorithms. With statistical method, a smaller NWR can be acquired. And, it is the first time that the statistical method was proposed to compare the RWA algorithms. Two RWA algorithms can be compared by contrasting the distribution of the NWRs obtained by each RWA algorithm.
In the presence of the increasing demand, it is urgent for the wavelength division multiplexing (WDM) optical transport network not only to boost the transmission capacity but also to enhance the survivability. In this paper, A M:N protection scheme for WDM optical transport networks is proposed and demonstrated. The M protection channels are used to transmit low priority traffic in normal condition, and can be switched automatically to replace a working channel when failure occurs to that working channel. Compared with the 1 + 1 protection system, the proposed scheme achieves better performance with lower costs. An optical add/drop multiplexer (OADM) is also proposed with the protection scheme. Any channel in M or in N can be dropped in the OADM according to the demand of the network management center. When failures occurred to a working channel that should be dropped in the OADM, and when the traffic on the failed working channel has already been switched to a protection channel at the previous node, the protection channel is dropped in the OADM automatically instead of the failed working channel. Then the corresponded adding signal is still added to the working channel, i.e., the protection channel is set free and can be used to carry low priority traffic again to the next node. Experimental result shows that the protection takes place within 7 ms, which satisfies the requirement of the ITU-T recommendations.
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